402^2點樣分解 要變成(a+b)(a-b)=a^2-b^2 or (a+b)^2=a^2+2ab+b^2?
回答 (8)
2016-01-06 10:16 am
402^2
=(400+2)^2
=160000+1600+4
=161604
=(400+2)^2
=160000+1600+4
=161604
2016-01-05 7:17 pm
Sol
(a+b)^2=a^2+2ab+b^2
402^2=(400+2)^2
=400^2+2*400*2+4
=160000+1600+|4
=161604
(a+b)^2=a^2+2ab+b^2
402^2=(400+2)^2
=400^2+2*400*2+4
=160000+1600+|4
=161604
2016-01-21 4:31 am
用(a+b)^2=a^2+2ab+b^2 分解 402^2
402^2=(400+2)^2
=400^2+2*400*2+2^2
=160000+1600+4
=161604
402^2=(400+2)^2
=400^2+2*400*2+2^2
=160000+1600+4
=161604
2016-01-13 6:13 am
(a+b)^2=a^2+2ab+b^2
= 161604
= 161604
2016-01-09 5:09 am
2016-01-07 1:50 pm
402^2
= (400+2)^2
= 400^2 + 2*400*2 + 2^2
= 160000 + 1600 + 4
= 161604
= (400+2)^2
= 400^2 + 2*400*2 + 2^2
= 160000 + 1600 + 4
= 161604
2016-01-06 10:05 am
402*402=(400+2)*(400+2)=400^2+2^2+2*400*2
2016-01-05 10:37 pm
402^2=161604
分解變成 402^2=(a+b)(a-b) 有三個方法:
402^2=(40402+40400)(40402-40400)=(80802)(2)=161604
402^2=(13470+13464)(13470-13464)=(26934)(6)=161604
402^2=(670+536)(670-536)=(1206)(134)=161604
還有
402^2=(a+b)^2
可以用二數a,b so that a+b=402.
螞蟻雄兵 已舉一例 402=400+2.
但也可以用 a=200, b=202, ...(200+202)^2=40000+2*40400+40804=161604, etc.
分解變成 402^2=(a+b)(a-b) 有三個方法:
402^2=(40402+40400)(40402-40400)=(80802)(2)=161604
402^2=(13470+13464)(13470-13464)=(26934)(6)=161604
402^2=(670+536)(670-536)=(1206)(134)=161604
還有
402^2=(a+b)^2
可以用二數a,b so that a+b=402.
螞蟻雄兵 已舉一例 402=400+2.
但也可以用 a=200, b=202, ...(200+202)^2=40000+2*40400+40804=161604, etc.
收錄日期: 2021-04-18 14:23:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160105081644AAGH55R